M7. Modified wheels must conform to the following specifications: A. Wheels must be 31mm diameter or smaller. B. Wheels must be constructed of plastic, rubber, or polyurethane. C. Wheel hubs may be made of metal, but may never come in direct surface contact with the track.

M8. There must be at least four wheels on the car, however, it is not required that all four wheels make contact with the track surface.

M9. The wheels must be attached directly to axle and spin freely.

AXLES:

M10. Axles must not be connected to any device that mechanically alters rotation and spin.

M11. Lubricants must be dry on the axle at race time. Wet, oily, or greasy axles are not allowed. Over-application of lubricant which results in excessive shedding onto the track is not allowed. Approved lubricants include (but are not limited to) graphite, Teflon, and Nyloil.